Eigenfrequencies and quality factors of vibration of aluminium alloy spherical resonators

We report the eigenfrequencies and quality factors of vibration of the lowest quadrupole modes of Al 5056 spherical resonators at very low temperatures, Q values of spheroidal modes ranging from 3 x 10(6) to 2 x 10(7) in a bulk sample and from 1.7 x 10(6) to 8 x 10(6) in an explosively bonded sample were measured. A Q value of 1.2 x 10(8) was found in a higher order mode of the bulk sample, Independence of the quadrupole modes was measured within one part in 10(5) in amplitude.